I'm normally not a JD man, but I have what I think may be a great opportunity: a neighbor a couple miles away asked me to look at his tractor, PTO was making a racket. I drove over today to find a 430, don't know the year. I guess it's what you would call a wide front. It started up and ran like a champ. When the Pto is engaged and the mower starts running, there's a loud knock coming from below the gear shifter. I don't know much about these, and only thought I could help him if it was something obvious. It looks like its been painted years ago with a paint brush, has the usual leaks and weeps, tires have cracks but 90% tread, 2 new ones on the front. He called a local shop and they said they would give him scrap value or it would be $ 500 just to open it up. He said " if somebody would give me $600, I'd use it as a down payment on a new compact hydrostatic my wife could use" what is the likely culprit and could I repair and make a few bucks? Seems like a good deal, what do y'all think? I can provide pictures and serial #s tomorrow if yall think its worth pursuing.